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toolchain: banner purge + WHY-only comment sweep (rule 8)

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selfhost/, cmd/, internal/ join the tree-wide sweep: every section
banner dies (91 selfhost + the cmd C-style dividers -> 0); narration
and stale contracts deleted (pre-#22 bundler notes, retired
single-PT_LOAD and no-archive claims, superseded ABI tables); every
ref/harec/qbe cite, task cite, encoding/ELF contract, and rule-10
twin pointer kept; lost lifetime/rationale lines restored where the
sweep over-cut (elf_globals ownership, kwtab linear-scan). Comment-
only proven: all five wwstage tool binaries byte-identical across
the sweep; test-commit, test-byteid (161+1399, 0 pinned-divergent),
and test-bootstrap (fixed point + 991-995 byte-id) all exit 0.
The read-through banked 66 latent-bug leads (checkpoint).
This commit is contained in:
Hojun-Cho
2026-08-08 23:14:03 +09:00
parent 83f5956df2
commit 62b9d20383
60 changed files with 232 additions and 1045 deletions
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25
cmd/w6a/asm.c
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@@ -1,8 +1,4 @@
/*
* asm.c — encode the parsed Aprog list into amd64 machine bytes,
* appending to Asm.text. Relocations for CALL/branch targets that
* resolve to externals are queued in Asm.relocs.
*
* Encoding subset: the instructions cgen emits today. Operand shapes
* we accept:
* MOVQ $imm, reg — C7 /0 imm32 (REX.W) [imm fits in i32]
@@ -95,8 +91,6 @@ a_addreloc_data(Asm *a, u64 off, int kind, Asym *s, i64 add)
a->relocs = r;
}
/* ------ register codes ------------------------------------------- */
/* low 3 bits of register encoding */
static int
rcode(int r)
@@ -137,14 +131,12 @@ is_xmm(int r)
return r >= D_X0 && r <= D_X15;
}
/* ModR/M byte */
static u8
modrm(int mod, int reg, int rm)
{
return (u8)(((mod & 3) << 6) | ((reg & 7) << 3) | (rm & 7));
}
/* emit REX with W=1 plus optional R/B for high regs */
static void
emit_rex(Asm *a, int regbit, int rmbit, int w)
{
@@ -155,9 +147,7 @@ emit_rex(Asm *a, int regbit, int rmbit, int w)
if (b != 0x40 || w) a_emit_byte(a, b);
}
/* encode mod/disp for [base+disp]; returns 0 on ok.
* Special-cases SP (needs SIB) and BP (forces disp).
*/
/* Special-cases SP (needs SIB) and BP (forces disp). */
static void
emit_modrm_mem(Asm *a, int reg_field, int base, i64 disp)
{
@@ -191,7 +181,6 @@ encode_rr(Asm *a, u8 opcode, int src, int dst)
a_emit_byte(a, modrm(3, rcode(src), rcode(dst)));
}
/* MOVQ src reg → mem(base, disp). opcode = 0x89 */
static void
encode_rm(Asm *a, u8 opcode, int src_reg, int base, i64 disp)
{
@@ -200,7 +189,6 @@ encode_rm(Asm *a, u8 opcode, int src_reg, int base, i64 disp)
emit_modrm_mem(a, rcode(src_reg), base, disp);
}
/* MOVQ mem(base, disp) → reg. opcode = 0x8B */
static void
encode_mr(Asm *a, u8 opcode, int dst_reg, int base, i64 disp)
{
@@ -250,7 +238,7 @@ sse_mr_load(Asm *a, u8 prefix, u8 op2, int reg_op, int base, i64 disp)
emit_modrm_mem(a, rcode(reg_op), base, disp);
}
/* like sse_mr_load but encoded with REX.W (used by CVTTSD2SI / CVTSI2SD
/* like sse_rr but encoded with REX.W (used by CVTTSD2SI / CVTSI2SD
* which target/source 64-bit integer regs) */
static void
sse_rr_w(Asm *a, u8 prefix, u8 op2, int reg_op, int rm_op)
@@ -262,8 +250,6 @@ sse_rr_w(Asm *a, u8 prefix, u8 op2, int reg_op, int rm_op)
a_emit_byte(a, modrm(3, rcode(reg_op), rcode(rm_op)));
}
/* ------ second-pass helper: resolve labels to addresses ---------- */
static u64
resolve_label(Asm *a, const char *name)
{
@@ -281,8 +267,6 @@ label_defined(Asm *a, const char *name)
return 0;
}
/* ------ first pass: encode ---------------------------------------- */
/* For local labels, we record a "fixup" — an offset in .text that
* needs to be patched once the label is resolved at end of pass. */
typedef struct Fixup Fixup;
@@ -307,10 +291,9 @@ int
a_encode(Asm *a)
{
fixups = NULL;
const char *cur_text = NULL; /* current TEXT name */
const char *cur_text = NULL;
(void)cur_text;
for (Aprog *p = a->head; p; p = p->link) {
/* Define any pending label at the current PC */
if (p->label) {
Asym *s = a_intern(a, p->label);
s->defined = 1;
@@ -800,7 +783,6 @@ a_encode(Asm *a)
/* R_X86_64_PLT32 (4); addend -4 */
a_addreloc(a, reloff, 4, s, -4);
} else if (p->to.type == D_BRANCH) {
/* local call to a label */
a_emit_byte(a, 0xE8);
add_fixup(a->textlen, p->to.sym);
a_emit_u32(a, 0);
@@ -846,7 +828,6 @@ a_encode(Asm *a)
}
}
/* second pass: patch fixups */
for (Fixup *f = fixups; f; f = f->next) {
if (!label_defined(a, f->label)) {
fprintf(stderr, "w6a: undefined label '%s'\n", f->label);